:CHANnel:SIRC:INReduction
Command Syntax
:CHANnel{1:8}{A|B|C|D}:SIRC:INReduction {ON | OFF}
Where {1:8}{A|B|C|D} identifies a specific channel.
Query Syntax
:CHANnel{1:8}{A|B|C|D}:SIRC:INReduction?
Description
For System Impulse Response Correction (SIRC), turns on or off the Intrinsic Noise Reduction setting. Intrinsic Noise Reduction reduces intrinsic noise that is present on a waveform. By default, this setting is on.
The SIRC correction data is a digital filter that is used to improve the response of the input channel's reference filters to more closely match an ideal receiver. SIRC data is unique to a specific DCA-M or N1000A plug-in module's model and serial number. SIRC calibration data is stored inside DCA-M and N1000-series plug-in module memory.
When Intrinsic Noise Reduction is turned on, any noise that is contributed by the device under test will not be reduced and will be included on the waveform and in any measurements. Increasing the Samples/UI (:ACQuire:SPUI), increases the amount of intrinsic noise and jitter that can be removed.
Because the entire pattern must be acquired, there can be a delay in time before waveform data is displayed.
This setting is available when SIRC is applied and the entire pattern is acquired (:ACQuire:EPATtern).
When this setting is turned on, if you are applying a TDECQ Equalizer to the waveform it is recommended that you turn the operator's Low-SNR Measurement Mode setting off (:SPRocess1:TEQualizer:LSNR OFF).
Unlike the TDECQ equalizer's Low-SNR Measurement Mode setting, a Precision Timebase (PTB) can be turned on when using Intrinsic Noise Reduction.
Requires FlexDCA revision A.08.30 and above.
Example Command
FlexDCA.write(':ACQuire:EPATtern ON')
FlexDCA.write(':SPRocess1:TEQualizer:LSNR OFF')
FlexDCA.write(':CHANnel2B:SIRC:INReduction ON')
FlexDCA.write(':ACQuire:SPUI:MODE MANual')
samplesUI = float(FlexDCA.read(':ACQuire:SPUI?')) * 1.1
FlexDCA.write(":ACQuire:SPUI " + str(samplesUI))